2 TONE IMD Measurement In Power Sweep Option and NVNA Option

Hi, I am looking forward to perform 2 Tone Measurement. There seems two option for me to perform the 2 tone measurement. One is in Software network analyzer-> stimulus-> power & att -> RF path -> two tone and the other one is in Software NVNA-> follows multitone setup steps. What are the differences between this two measurement options? If my DUT has one input and two output signal how can i configure the system to measure to single source and two output receiver? Thank you Sincerely Jaz